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Retirement Plans
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Retirement Plans
Retirement Plans

The components of the net periodic benefit cost for our plans were as follows:
 
3 Months Ended March 31,
 
Defined Benefit Pension Plans
Retiree Health Care Plan
 
 
2017
 
2016
 
2017
 
2016
Service cost
$
2.4

 
$
1.6

 
$
—

 
$
—

Interest cost
2.7

 
3.0

 
0.1

 
0.2

Expected return on assets
(2.6
)
 
(2.9
)
 
—

 
—

Other
0.6

 
0.3

 
(0.1
)
 
(0.2
)
Total benefit cost
$
3.1

 
$
2.0

 
$
—

 
$
—


During the three months ended March 31, 2017, contributions made to our pension plans were $1.4 and contributions made to our retiree health care plan were $0.3. During 2017, we expect to make total contributions of approximately $4.2 to our pension plans and to fund our retiree health care payments as incurred.